Note 7 - Per Share Data - Reconciliation of the Basic and Diluted Loss Per Share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net income	$ 68,068,826	$ 33,904,806	$ 69,450,766
Less: Change in fair value of warrants	0	400,663	117,770
Net income, adjusted for change in fair value of warrants for diluted earnings per share	$ 68,068,826	$ 33,504,143	$ 69,332,996
Weighted-average shares (in shares)	71,362,209	72,929,550	75,322,194
Effect of potential common shares (in shares)	317,061	616,951	1,080,522
Weighted-average shares: diluted (in shares)	71,679,270	73,546,501	76,402,716
Basic earnings per share (in dollars per share)	$ 0.95	$ 0.46	$ 0.92
Diluted earnings per share (in dollars per share)	$ 0.95	$ 0.46	$ 0.91